What is the scientific definition of fuel?

Answer 1

A substance that produces useful energy when it undergoes a chemical or nuclear reaction. Fuel such as coal, wood, oil, or gas provides energy when burned. Compounds in the body such as glucose are broken down into simpler compounds to provide energy for metabolic processes. Some radioactive substances, such as plutonium and tritium, provide energy by undergoing nuclear fission or fusion.

Answer 2

Fuel is a substance that undergoes combustion to produce energy, typically in the form of heat or light. It is used to power engines, machinery, and other devices by converting its chemical energy into mechanical work. Examples of fuels include gasoline, diesel, natural gas, and coal.